<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <div v-if="!isLogin">
        <a href="javascript:void(0)">注册</a>
        <a href="javascript:void(0)" @click="isLogin = true">登录</a>
    </div>
    <div v-else>
        <input type="text" v-model="name1">
        <input type="button" value="添加" @click="f()">
        <input type="button" value="添加" @click="arr.push(name1)">
        <a href="javascript:void(0)" @click="isLogin = false">登出</a>
    </div>
    <ul>
        <li v-for="name in arr">{{name}}</li>
    </ul>
</div>
<script src="../js/vue.js"></script>
<script>
    let v = new Vue({
        el: "body>div",
        data: {
            arr: ["刘备", "关羽"],
            isLogin: false,
            name1:""
        },
        methods: {
            f(){
                v.arr.push(v.name1)
            }
        }

    })
</script>
</body>
</html>